Forty years ago, after many years of successful use of thyroid therapy, leading gynecologists in this country and elsewhere were reporting thyroid had cured more menstrual disorders than all other medications combined. Unfortunately, that lesson seems to have been largely lost.

In study at the Mayo Clinic covering fifty consecutive young women with hypothyroidism, twenty-eight has menstrual disturbances. Abnormally profuse menses was a common disturbance frequent bleeding between periods was another in some cases, both problems were present. Thyroid therapy relived the disturbances.

Many of the women who benefited from thyroid therapy provided added evidence that it was the thyroid which was responsible. There were the women who, upon being relieved of their {menstrual} problems, stopped taking medication only to return in a few months with their original complaints. Thyroid therapy again overcame their difficulties.

On thyroid therapy, more than 90 percent of those with painful menstruation were relieved, most of them completely. The results were fully as good in converting irregular periods to normal, regular ones. And in six of seven women with excessive flow, normal flow was established.

But the problem remains two fold: the need for recognition that low thyroid function very often can provoke menstrual problems, and the need for recognition, too, that hypothyroidism may be present despite laboratory tests suggesting it is not.